Pavement wrecking machine



Nov. 10, 1931. w v. CORNETT PAVEMENT WRECKING MACHINE I Filed Feb. 7, 1927 2 Sheets-Sheet 1 Nov. 10, 1931. w v. coRNETT PAVEMENT WRECKING momma Filed Feb. 7, 1927 2 Sheets-Sheer. 2

I Patented Nov. 10, 1931 VF'UNITED STATES PATENT!) OFFICE WALTER VANCE CORNETT, OF LOS ANGELES, CALIFORNIA, ASSIGNOB TO RAPID PAVE- MENT BREAKER CORPORATION, A CORPORATION OF NEVADA.

PAVEMENT WRECKING MACHINE 4 Application filed February 7, 1927. Serial 170. 168,366.

This invention relates to devices for breaking concrete, pavement and the like.

The chief objects thereof are to provide a machine of a type employing an impact tool for tearing up pavement preparatory to repairing the same or for laying conduits, which machine shall be convenient and simple of operation, shall not require to be lifted by the operator but shall be entirely selfsupporting at all times and also freely transportable, whose impact element shall be so mounted as to be adjustable to provide a relatively wide field of operation for a single positioning of the machine, and which impact element shall have such mass and be so propelled as to be capable of striking a highly effective blow for the purpose of penetrating the pavement.

Briefly stated, the invention'comprises' a movable support such as a truck, upon which there is positioned a pavement-breaking impact tool adapted to be shiftedhorizontally to increase itsrange ofopera-tion, and preferably also mounted to be inclined somewhat from the vertical at the will of the operator without shifting its supporting frame, as by swinging on a horizontal axis, for varying its direction of movement and also further I an increasing its field. The tool conveniently is carried on a platform or movable frame and includes a cylinder and a piston operated by compressed air which may be supplied by an engine and a compressor also carried by the platform, the air supply being controlled, for example, by the operator through the me dium of a valve. In its preferred form the pavement-rupturing tool is a massive block reciprocable between guides by means of a rod actuated by the piston, and on the under side of the block a plurality of spurs or impact bits is fixed for the function of penetrating, disrupting and tearing up asphaltic pavement and the like when forcibly propelled downward under influence of the pneumatically driven piston and block.

In the accompanying drawings wherein one embodiment of the invention is shown by way of illustration,

' Fig. 1 is a plan view of the device as 2112- i Fig. 3 is a transverse vertical section taken from the line'3-3 of Fig. 2, and I Fig. 4 is a cross sectional detail taken on line 4--4 of Fig. 3 showing the mounting of the impact bits in the reciprocating block. As shown, the chassis 10 of a motor truck supports a frame comprising a pair of parallel rails 12 and a platform 14, said frame bein carried by means of a cross beam 15 on the truck chassis and a curved track 16 at the rear of saidchassis, which track is suitably braced and sup orted at 18 and 19. The forward end of sai frame is pivoted on the beam 15 through the medium of a pivot pin 20 and washers 21, while the rear end of said frame is movable horizontally about said pivot upon said track 16 through the medium of sets of rollers or wheels 22 engaging the track and journaled in brackets 24 rigidly secured to the sides of the rails 12.

Upon the platform 14, there are mounted an engine -E- and a compressor C actuated therefrom for the purpose of supplying a .tank -T- with compressed air: rom tank --T a compressed air line 25 extends to a distributing and exhausting valve 26 of standard construction by means of which the air is passed to and exhausted from the opposite ends of a cylinder 28 which contains a piston 30 reciprocable therein, this piston and cylinder constituting an air hammer. Thus, air is being exhausted from the upper end of cylinder 28 through one of the passages of valve 26 by way of pipe 31 and flexible connection 32 at the same time that air under pressure isbeing applied to the lower end of said cylinder through another passage in valve 26 and by way of pipe 33 and flexible connection 34, whereby the piston is elevated. I

The air hammer comprises a cylinder head 35 secured to a frame forming the cylinder proper 28 and this is provided with trunnion;- 36 whereby the entire hammer is journaled in bearings 37 mounted in depending sup-= porting plates 38 carried by the rails 12 of a the iool-supporting frame; Thus the entire hammer may be swung on a horizontal axis,

a lever 40 being secured to one'of the journals 36 for the purpose of swinging the cylinder,

said lever carrying a latch 41 adapted to 5 engage a rack 42 on the adjacent rail 12 for retaining the lever and the cylinder in adjusted osition. Normally the entire hammer is alanced in trunnions 36 and may be so operated. o The lower end of cylinder 28 is fitted with ,a head 44 to which there is bolted a pair of opposed depending channel-shaped guides 45 between which a relatively massive block 46 is adapted to be reciprocated under the influence of the piston rod 48 which is connected with the piston 30 and extends from the cylinder 28 through a packing gland 50 in the lower cylinder head 44. The lower end of said rod preferably is movably connected tion may be in the form of a ball and socket mounting 52 wherein a convex retaining plate 54 is bolted to and cooperates with the block for retaining the ball in its socket. The under side of said block 46 is provided with a plurality of preferably tapered sockets which receive th correspondingly tapered upper ends of a plurality of spurs or drill bits 55 adapted to penetrate the pavement -P- for tearing up the latter. Bolts 56 serve to removably retain said bits in position. All of the aforesaid parts connected to the hammer are freely movable therewith in the trunnions 36.

In order that the impact tool just described, which comprises the piston 30. the block 46 a and the bits 55, may be moved transversely on the track 16, a'cable 60 (Fig. 1) is connected with the opposite ends of the track and passed around a pulley 62 fixed to a rotary stem 64 mounted on the platform 14 as by means of a standard 65, said stem being rotatable through the medium of a crank 66. i

In operating the device, the operator takes a position alongside the valve 26 and can therefore easily reach lever 40 and crank 66, all of the controls therefore being within reach of one operator who moves with the 50 movable frame. The impact tool 46, 55 with its cylinder 28 is adjusted transversely by swinging the rear end of frame 12 about the pivot 20 through the medium of the crank 66, pulley 62 and cable 60, the rollers 22 of the frame travelling upon the curved track 16. Compressed air is stored in the tank -T by the compressor C- under influence of engine E--, and is passed by line through valve 26 and lines 31 and 33 to either the upper or the lower end of cylinder 28 according to the setting of valve 26. The tool is lifted when air is passed to the lower end of the cylinder, and is forcibly driven into the pavement when air is passed to the upper end of the cylinder. By swinging the frame 12 with the block 46,. and as shown this connec-- nee s/a1 from side to side the range of the tool is cor-- respondingly increased, and by swinging thecylmder 28 on its trunnions through the medium of lever 40, the range of the tool not onl is further increased but the angle at whlch the bits 55 enter the pavement is varied and the breaking and disintegrating efiect upon the pavement is enhanced. Therefore, as the truck is moved slowly forward and the tool is swung from side to side by the operators manipulation of the crank 66, a strip of pavement of appreciable width is gradually torn up by the bits 55 under the combined influence of the weight of the block 46 and the action of the pneumatically operated pis ton 30 controlled by valve 26. As far as the operator is concerned the parts are easily adjusted, controlled and operated, and work ma proceed with the maximum of dispatch an efiicien'cy-without the necessity of lifting heavy implements, as is at present commonly required for this type of work.

It is obvious from the foregoing description that only one operator is necessary to operate the pavement breaking machine. That is to say, to swing the frame, to actuate the blows of the hammer at various speeds (depending upon the work to be done and the hardness with which it is desired to strike the blows) while at the same time by operating the lever 40, the hammer may be inclined from the vertical at the will of the operator without shifting the supporting frame.

While the truck mentioned herein may be any type of vehicle it is preferably an ordinary self-propelled vehicle, such as an automobile truck and is controlled by a driver in the usual manner, the control of the truck and its operation being entirely independent from the operation of the air hammer, except that the hammer operator gives the necessary directions to the driver from time to time as required when movin the whole machine during the progress 0 the work.

' The power plant consisting of compressor cylinder, a pneumatically operated piston mounted in said cylinder, means secured to said frame to adjust said cylinder at various inclinations to the vertical, a depending impact bit mounted in said guides and attached to said piston and a source of power carried by said truck for actuating said tool.

thereon, a cylinder secured to said frame, a pneumatically operated piston in said cyl1nder, guides depending from said cylinder, a block connected with and o erated from said piston and adapted to wor in said guides, a plurality of pavement penetrating bits carried by said block, and a source of ower carried by said truck for actuating sai tool.

.4. A pavement breaking machine comprising a truck, a movable frame thereon, an impact tool carried by said frame and comprising a cylinder rovided with trunnions and bearings there or mounted on said frame, depending guides connected to the lower end of said cylinder, a pneumatically operated piston mounted in said cylinder, a lever connected to one of said trunnions for adjusting the cylinder at various inclinations to the vertical, and an impact bit mounted, in said guides and connected to and movable with said cylinder.

5. A pavement breaking machine comprising a truck, a frame supported'thereby and adapted to move about a central axis and having a platform, a fluid engine mounted on said platform, hammer mechanism mounted on said platform and adapted to be actuated by said fluid engine, connections between said engine and hammer, and a control valve in said connections adapted to be operated from the platform. 7 v

6. A pavement breaking machine com rising a truck, a frame including a plat orm supported thereby and adapted to move about a central axis, asource of power mounted on said frame, an air compressor mounted on said frame and connected to said power source, an air hammer mounted on said platform, flexibleconnections between said compressor and said air hammer, and a control valve between said compressor and hammer adapted to be operated from the platform.

7. A pavement breaking machine comprising a truck, a frame supported thereby and adapted to move about a central axis, a source of power carried by said frame, an air hammer carried by said frame, connections between said source of power and said hammer, and means on said frame for manually controlling the movement of said frame and the reciprocations of said hammer.

8. A pavement breaking machine comprising a truck, a frame supported thereby and adapted to move about a central axis, a source of power mounted on said frame, an air compressor mounted'on said frame and connected to said power source, an air hammer mounted on a horizontal axis carried by said frame and adapted to be inclined somewhat from the'vertical at the will of the operator, said hammer including a piston, and control 'mechanism mounted on said frame and movable therewith for movin said frame about said axis and for controlling the reciprocation of said piston in said hammer.

9. A pavement breaking machine comprising a truck, a frame supported thereby and adapted to move about a central axis, a

source of power mounted on said frame, an

air compressor mounted on said'frame and connected to said power source, an air hammer mounted on said frame and connected to said compressor comprising a substantially vertically disposed piston and cylinder, and control mechanism mounted on said frame and movable therewith for moving said frame about said axis and for controlling the reciprocation of said piston in said cylinder.

10. A pavement breaking machine comprising a truck, a curved track secured there-.

to, a frame adapted to move on said track about an axiscentrally disposed in relation to said track, means connected to a fixed portion of the truck and means on said frame enga 'ng said first means whereby said frame may e moved, a pavement breaking tool adjustably mounted on said frame, and power means carried by said frame for operating said tool.

ILA. pavement breakin machine comprising a freely transportable vehicle having a rear axle and wheels, a frame supported thereby and movable thereon about a central axis, a curved track at the rear of said vehicle adapted to support the rear end of said frame, rollers between said frame and track, a fluid engine mounted on said frame above said vehicle axle, a pavement breaking machine mounted at the rear of said frame and extending rearwardly from said vehicle, means under the control of the operator for moving said frame over said track to various positions thereon, and a valve adjacent said means for controlling the o eration of said pavement breaking device w ereby an operator may control the, movement of the frame and the operation of the pave lee ' fluid from said tank, connections between said tank and hammer, and a control valve in said connections.

13. A pavement breaking machine compris- 5 ing a vehicle, a movable frame thereon, an air hammer, trunnions intermediate the ends of said hammer, sup orts for said trunnions on said frame where y said hammer is movably positioned thereon, guides connected to said hammer movable therewith and positioned below said frame, and a tool connected to said hammer.

14. A pavement breaking machine comprising a vehicle, a movable frame thereon including a platform, an-air hammer having a fluid actuated piston, a mounting for said hammer carried by said platform Whereb the hammer may be displaced from the vertl cal, uides connected to said hammer and piston and adapted to work in "said guides, and a source of power for said hammer carried by said frame.

15. A pavement breaking machine comprising a vehicle having a rear axle and wheels, a track supported thereby, a movable frame supported thereby including rollers engaging said track, said frame having an axis located forward of said rear axle, means carried by said frame for manually controlling the movement thereof about said axis, a

source of power carried by said frame, hammer mechanism connected to said power source and carried by said frame, a mounting for said hammer mechanism whereby the samemay be moved independently of the movement of said frame, and means for controlling the actuation of the hammer mechanism by said power source.

16. A hammer comprising a cylinder head, a cylinder frame connected thereto, trunnions on said frame, a piston in said cylinder, a rod connected to said piston, a head for said cylinder having an aperture for said rod, guides connected to said last head, a block movably connected to said rod and adapted to reciprocate in said uides, a supporting frame for all of the foregoing wherein said trunnions are movably supported, and a source of power carried by said frame connected to said cylinder and adapted to reciprocate said piston therein.

17. A hammer comprising a unit assembly consisting of a cylinder, a piston therein, an impact tool connected to said piston and adapted to directly engage the work to be struck, a frame adapted to movably support said unit in a normally vertical position, means for displacing said unit from its normal position, means for locking said unit in said displaced position, and a source of power for operating said piston carried by said frame.

18. In a hammer comprising a unit assembly and a supporting frame therefor as mova le therewith, a block connected to said' Leeann claimed in claim 17, a valve .mounted upon said unit assembly and movable therewith for controlling the operation of the piston therein.

19. A hammer com rising a unit assembly consisting of a. cylin er, a piston therein, an impact tool connected to said piston and adapted to directly engage the work to be struck, a block connected to said piston, guides for said block, a supporting frame, means for securing the aforesaid unit in said frame whereby it will hang vertically therein with its heaviest part below said frame, and means for displacing said assembly from the vertical and locking the same in said displaced position. I

z In witness that I claim the foregoing I have hereunto subscribed my name this 20th day of January, 1927.

. WTV. (JO'RNETL as 

